Recorders

KVN station has three recording systems, Mark5b, Mark5b+ and DIR-1000.

Mark5b and Mark5b+ recording systems

Mark5b and Mark5b+ are hard disk recording systems developed at Haystack observatory.
The maximum data rate of Mark5b and Mark5b+ systems are 1Gbps and 2Gbps, respectively.
For more details, please see http://www.haystack.mit.edu/tech/vlbi/mark5.
At KVN stations, Mark5b records the output data stream of digital filter and Mark5b+ records 2Gbps data stream which is one 512MHz-bandwidth data stream.
Refer to receiver block diagram section for data stream connection and digital filter mode section for available bandwidth and number of channels of 1Gbps data stream.
Mark5b and Mark5b+ can be used simultaneously for 3(=1+2) Gbps recording.

DIR-1000 recording system

In addition to the Mark5 recording system, DIR-1000 tape recording system was equipped at KVN station.
This recording system was provided by NAOJ and has been used for test observations of KVN+VERA combined array.
Data rate of this recording system is 128Mbps.
Its data should be correlated at the Mitaka correlation center of NAOJ.